National Dental Examining Board of Canada (NDEB) Practice Exam 2025 - Free NDEB Practice Questions and Study Guide

Question: 1 / 400

Doubling the diameter of a round SS orthodontic wire decreases its springiness by how many times?

2

4

6

8

When the diameter of a round SS orthodontic wire is doubled, its cross-sectional area is quadrupled, which means that the wire is now four times stiffer. This decrease in flexibility reduces its springiness by 8 times, making option D the correct answer. Option A, 2 times, is incorrect as doubling the diameter does not have a linear effect on the stiffness and springiness of the wire. Option B and C, which suggest a decrease by 4 or 6 times, are also incorrect as they do not accurately reflect the increase in stiffness and decrease in springiness that occurs when the diameter is doubled. Option D is the best and most accurate choice.

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